#    Supsta
#    Copyright (c) 2014 Sebastian Dufner
#
#    This file is part of Supsta.
#
#    Supsta is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    Supsta is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

##
#

module Supsta
  class TargetProvider
    def compile(compiler, options = {})
      dependencies.select(&:modified?) {|d| d.compile(compiler, options)}

      compiler.target.active_layer
    end

    def modified?
      dependencies.any? &:modified?
    end

    def to_hash
      {dependencies: dependencies.map(&:to_hash)}
    end

    def update!
      dependencies &:update!
    end

  end

  module LeafProvider
    def dependencies
      fail ProviderError, "#{self.class} has no dependencies"
    end

    def update!
    end
  end

  class ProviderError < StandardError
  end
end
